So, anyone care to tell me why stacking in a tiny clump and never moving except to drop stacks works? It's how we kill it and it seems far easier. We only send players out to drop stacks at 4+. If they get targeted while dropping stacks, they run in. The ball always explodes instantly in melee range. There are no huge drops in raid hp.

Why does this work?

This is an idiotic mechanic that should have been explained better by blizzard.